Cydia

For going that extra step further to customize your iOS 7 device, be sure to check out a new free jailbreak tweak called CCBackground by iOS developer The JailPad.

As the name implies, CCBackground will allow you to set any image that you want as the background for iOS 7's Control Center. The tweak uses an image that you choose from your Photo Library, so you'll want to save yourself a nice image file that you like from Google, or some other source, such as your Camera.

Once you've installed the tweak and found an image that you want to use, you're ready to head over to the Settings application and configure your Control Center background from the new preferences pane:

From here, the tweak is enabled or disabled on demand, your image is selected, and you can choose what to do while the device is in landscape mode. While in landscape mode, you can choose for the image to be the background of Control Center, or for the image to be completely disabled while in landscape mode.

It's worth noting that the tweak is only compatible with iPhones and iPod touches, not iPads. If you would like to give CCBackground a try, it's available for free right now in Cydia's BigBoss repository.